Comment 39 for bug 565810

> > so I'm currently not able to collect security updates
>
> I don't understand what you are speaking about, but that's probably not related to Medibuntu. Ubuntu mirrors are up, so you're > able to collect security updates.

What he's saying is that having the packages.medibuntu.org in the sources.list disables the update, because apt is stuck forever waiting for medibuntu server..